Physical Therapy Guide to Trismus
Trismus is an inability to open the mouth or jaw. Trismus interferes with many daily activities—chewing, swallowing, talking, brushing teeth, and even breathing. The condition may be caused by dental problems, cancer and cancer treatment, surgery, trauma, or other factors. With correct intervention from a physical therapist, trismus can improve in time, and full jaw function may return.
What Is Trismus?
The term trismus describes several conditions that cause an inability to open the mouth or jaw. The most common cause of trismus is inflammation of the soft tissue of the mouth due to:
- An impacted molar.
- Wisdom tooth removal.
- Removal of the tonsils.
Less common causes of trismus include:
- Radiation therapy to the face and neck.
- Tetanus (lockjaw), an acute infection from bacteria that usually enter the body through a wound.
- Myositis (muscle inflammation).
- Jaw nerve damage.
- Scarring of the tissues around the jaw or tongue. This can develop after a long period of not moving the jaw.
- Muscle atrophy (wasting) that can occur after as little as three days of not opening the jaw.
- Poor oral hygiene.
- Tumors or cancer.
- Trauma to the jaw area.
- Diseases, such as lupus and scleroderma.
Trismus can occur suddenly in the first nine months after radiation near the jaw joint (temporomandibular joint). This joint is also referred to as the TMJ. After that time the risk still exists, but the tightness tends to develop more slowly. Radiation treatments done near the TMJ or the muscles involved in chewing increase the risk for trismus. The risk increases with higher radiation doses.
Trismus tends to improve slowly. Studies suggest treatment may take from three to 12 weeks. Early treatment is the best way to prevent more severe problems. Your physical therapist will personalize a treatment program to your specific condition. The goals of your physical therapy program will be to:
- Speed the healing process.
- Reduce tightness in the jaw area.
- Help restore normal jaw movement and the ability to chew.
Signs and Symptoms
Symptoms of trismus include:
- Increased jaw pain.
- Inability to open the jaw. This means you cannot fit three fingers (lined up vertically) into the front of your mouth between the top and bottom teeth.
- A spasm or “tight” feeling when trying to open your mouth.
- Difficulty chewing, talking, breathing, and brushing and flossing your teeth.
If you have trismus, you may be at risk for choking. Trouble with chewing your food could cause you to change your diet, and lead to less than adequate nutrition. Even moving food around in your mouth can be hard with trismus because the tongue also may lose some mobility.
Not using your TMJ may lead to wasting or shrinking of the muscles that move the jaw, and possible damage to the TMJ surfaces.
Your medical team may suggest additional treatments to complement your physical therapist’s treatment. Using mouth splints to help with stretching has been proven effective. Other possible options include Botox injections to relax tight muscles, laser treatment, and surgery.
How Can a Physical Therapist Help?
Your physical therapist can help restore the natural movement of your jaw and improve your daily function. Trismus tends to develop slowly. In some people, it progresses so slowly that they don't notice it until they can only open their mouths half-way. The sooner you see your physical therapist, the better. Treatment that begins before trismus progresses is likely to be more efficient and effective.
If you have trismus, your physical therapist will choose the right treatments to improve your jaw movement and relieve pain.
Improve your jaw movement. Your physical therapist may prescribe stretches and range-of-motion exercises for your jaw. They will personalize the frequency and intensity of movements to ensure your safety. Your physical therapist may recommend specific techniques, such as stretching or self-mobilization, to minimize your pain and restore function.
Physical therapists also use hands-on techniques (manual therapy) to gently increase movement. Hands-on therapy also can help to relieve pain in tissues and joints. Manual therapy offers immediate and long-term effects on jaw movement for radiation-related trismus.
Your physical therapist may guide you through special "low-load" strengthening exercises. These exercises will avoid putting too much pressure on your TMJ. They can help you strengthen the muscles of the jaw to restore more natural, pain-free movement. Your physical therapist also may teach you gentle exercises that you can do at home to help you steadily improve your jaw function.
Relieve your pain. If your pain is severe, your physical therapist may apply treatments to reduce pain and improve motion. These may include electrical stimulation or deep heating. Physical therapists are experts at designing pain treatment programs that lessen the need for medication, including opioids.
* from choosept.com
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